How do I tell the Westlink from the M3 when travelling across Belfast?

The A12 Westlink runs along the western edge of Belfast city centre and connects the M1 with the M2, while the M3 runs over the Lagan Bridge towards the eastern harbour and Sydenham side.

Choose Westlink for the M1-to-M2 through movement; choose the M3 corridor when your route needs the harbour, Sydenham or east Belfast connection. The correct route depends on destination rather than traffic alone. Follow overhead destination signs and check motorway approaches before committing.